A Single Migration From Africa Populated the World, Studies Find.

[elleng]

'Modern humans evolved somewhere in Africa roughly 200,000 years ago. But how did our species go on to populate the rest of the globe?

Did humans flood out of Africa in a single diaspora, or did we trickle from the continent in waves spread out over tens of thousands of years? The question, one of the biggest in human evolution, has plagued scientists for decades.

Now they may have found an answer.

In a series of unprecedented genetic analyses published on Wednesday in the journal Nature, three separate teams of researchers conclude that all non-Africans today trace their ancestry to a single population emerging from Africa between 50,000 and 80,000 years ago.

“I think all three studies are basically saying the same thing,” said Joshua M. Akey of the University of Washington, who wrote a commentary accompanying the new work. “We know there were multiple dispersals out of Africa, but we can trace our ancestry back to a single one.”'>>>

http://www.nytimes.com/2016/09/22/science/ancient-dna-human-history.html?

[packman]

1. Shhh- don't tell the Trump supporters

Hell, they don't believe in science anyway

[marybourg]

2. Raises more questions than it answers.

But very interesting.

[DetlefK]

3. So, it was just homo sapiens that originated from that single wave?

[elleng]

4. Modern humans

[nitpicker]

5. DNA hints at earlier human exodus from Africa

http://www.bbc.com/news/science-environment-37408014

DNA hints at earlier human exodus from Africa
By Paul Rincon
Science editor, BBC News website


21 September 2016

From the section Science & Environment


Hints of an early exodus of modern humans from Africa may have been detected in living humans. Present-day people outside Africa were thought to descend from a group that left their homeland 60,000 years ago. Now, analysis of nearly 500 human genomes appears to have turned up the weak signal of an earlier migration. But the results suggest this early wave of Homo sapiens all but vanished, so it does not drastically alter prevailing theories of our origins.

Writing in the academic journal Nature, Luca Pagani, Mait Metspalu and colleagues describe hints of this pioneer group in their analysis of DNA in people from the Oceanian nation of Papua New Guinea.

After evolving in Africa 200,000 years ago, modern humans are thought to have crossed through Egypt into the Arabian Peninsula some 60,000 years ago. Until now, genetic evidence has shown that every non-African alive today could trace their origins to this fateful dispersal. Yet we had known for some time that groups of modern humans made forays outside their "homeland" before 60,000 years ago.

◾Fossilised remains found at the Qafzeh and Es Skhul caves in Israel had been dated to between 120,000 and 90,000 years ago.
◾Then in 2015, scientists working in Daoxian, south China, reported the discovery of modern human teeth dating to at least 80,000 years ago.
◾An additional piece of evidence recently came from traces of Homo sapiens DNA in a female Neanderthal from Siberia's Altai mountains. The analysis suggested that modern humans and Neanderthals had begun mixing around 100,000 years ago - presumably outside Africa.

In order to reconcile this evidence with the genetic data from living populations, the prevailing view advanced by scientists was of a wave of pioneer settlement that ended in extinction. But the latest results suggest some descendents of these trailblazers survived long enough to get swept up in the later, ultimately more successful migration that led to the settling of Oceania.
(snip)

[Jim__]

6. A video describing the study.

Another video and accompanying article at phys.org.

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